Nanocrystallization and magnetic properties of Fe-30 weight percent Ni alloy by surface mechanical attrition treatment |
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Authors: | Chunsheng Wen PhD Zi Chen Baoxu Huang PhD Yonghua Rong |
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Affiliation: | (1) School of Materials Science and Engineering, Shanghai Jiao Tong University, 200030 Shanghai, People’s Republic of China |
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Abstract: | A nanostructured surface layer was formed in Fe-30 wt pct Ni alloy by surface mechanical attrition treatment (SMAT). The microstructure
of the surface layer after SMAT was investigated using optical microscopy, X-ray diffraction, and transmission electron microscopy.
The analysis shows that the nanocrystallization process at the surface layer starts from dislocation tangles, dislocation
cells, and subgrains to highly misoriented grains in both original austenite and martensite phases induced by strain from
SMAT. The magnetic properties were measured for SMAT Fe-30 wt pct Ni alloy. The saturation magnetization (M
s
) and coercivity (H
c
) of the nanostructured surface layers increase significantly compared to the coarse grains sample prior to SMAT. The increase
of M
s
for SMAT Fe-30 wt pct Ni alloy was attributed to the change of lattice structure resulting from strain-induced martensitic
transformation. Meanwhile, H
c
was further increased from residual microstress and superfined grains. These were verified by experiments on SMAT pure Ni
and Co metal as well as liquid nitrogen-quenched Fe-30 wt pct Ni alloy. |
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Keywords: | |
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